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Subcutaneous injections go into your fat, often in the belly, thigh or upper arm
One study found that high doses of oral B12 (1,000 mcg daily) could provide adequate absorption even in the presence of intrinsic factor deficiency
Many people experience cognitive changes including difficulty concentrating, memory problems, or mental fogginess
Choosing the Right Needle Size Factors to Consider : Patient's Body Type : Thinner individuals may require shorter needles to avoid penetrating the muscle during SC injections, while individuals with more muscle mass may need longer needles for effective IM injections
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